<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Xml_Security
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Exception.php 2794 2007-01-16 01:29:51Z bkarwin $
 * @author     John Coggeshall <john@zend.com>
 */

/**
 * Zend_InfoCard_Xml_Security_Transform_Interface
 */
require_once 'Zend/InfoCard/Xml/Security/Transform/Interface.php';

/**
 * Zend_InfoCard_Xml_Security_Transform_Exception
 */
require_once 'Zend/InfoCard/Xml/Security/Transform/Exception.php';

/**
 * A object implementing the EnvelopedSignature XML Transform
 * 
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Xml_Security
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @author     John Coggeshall <john@zend.com>
 */
class Zend_InfoCard_Xml_Security_Transform_EnvelopedSignature 
    implements Zend_InfoCard_Xml_Security_Transform_Interface 
{
	/**
	 * Transforms the XML Document according to the EnvelopedSignature Transform
	 *
	 * @throws Zend_InfoCard_Xml_Security_Transform_Exception
	 * @param string $strXMLData The input XML data
	 * @return string the transformed XML data
	 */
    public function transform($strXMLData) 
    {
		$sxe = simplexml_load_string($strXMLData);
		
		if(!$sxe->Signature) {
			throw new Zend_InfoCard_Xml_Security_Transform_Exception("Unable to locate Signature Block for EnvelopedSignature Transform");
		}
		
		unset($sxe->Signature);
		
		return $sxe->asXML();
	}
}
